变阻器与AV示数变化类电路题,就是根据滑动变阻器阻值的变化,来判断电路中电流表、电压表示数如何变化的问题.这类题由于把有关电阻或用电器置于动态变化电路中,因而使变阻器具有“牵一发而动全身”的功效;且因这类题能在一定范围内检测学生解决实际问题的变通能力,所以历年被中考出题者所亲睐.在 Varistors and AV shows the number of changes in the class circuit, is based on the resistance of the sliding rheostat to determine the circuit in the ammeter, the number of voltage changes in the number of questions. Such questions due to the resistance or electrical appliances placed in the dynamic change circuit, Therefore, the varistor has the effect of “moving the whole body”; and because such questions can detect the ability of students to solve practical problems in a certain range, they have been favored by the candidates in the examination over the years.